rename or1200-utils.h appropriately in mor1kx driver
mor1kx_monitor.v: Fix l.divu instruction disassembly string
mor1kx-utils.h: Update header define wrapper
mor1kx driver update: a tidy and a feature addition

Change all references to or1200-utils.h to cpu-utils.h.

Add an exception state struct and pointer to it whenever exceptions are handled.
Add overflow and carry-bit software tests